And what about free speech, homosexuals can throw a parade? But Christians cant display a nativity scene?

Apples and oranges.

Any group wanting to have a parade can submit an application for a permit and have a parade. The streets are public and paid for and, in allowing the parade, the state takes no stand on any particular opinions that the applicant group has or holds. We have all kinds of parades here held by all sorts of groups and organizations and they are all peaceful events and they all make the news.

Placing a religious scene or any kind on state property with state permission is tantamount to the state endorsing religion. This is why students can't be forced to say the Pledge in schools--its called a coercive effect. The courts have ruled repeatedly on this. The law is clear.

I'm not trying to pick a fight, but I've been a school administrator and taken several legal and school law classes. You have to understand the rights of the adults and children under your protection so that you don't violate them and end up on the news, like a lot of school administrators do so frequently.